Excerpt from A Comparison of American Direct-Current Switchboard Voltmeters and Ammeters
Descriptions of electrical instruments usually give only very general information. For some purposes, however, it is necessary to have at least approximate numerical values of the details... of construction and operation of such instruments. For this reason the results of various tests and measurements are given in this article.
The test was divided into two parts - (i) the performance of the instruments, and (2) the determination of their structural constants and dimensions of parts.
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